16 week midwife appointment

Farrah • Female, 22 years old, 2nd child, Newcastle upon Tyne: United Kingdom 🇬🇧
Hey! I just had my first appointment with the midwife a few days ago and took my sister along for support, which also turned out to be very helpful as she knew more about our family health history than I did. When booking my 16 week midwife appointment my midwife stated that I need to come alone.. does anyone know the reason for this? As I would prefer to take someone with me.
P.s everything went well at my appointment and I'm just waiting for my scan date 😊😊